<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .title {
            font-size: 32px;
            font-weight: bold;
            color: red;
            border: 1px solid black;
            background-color: aqua;
        }
    </style>
</head>
<body>
    <h1>正常的标题标签</h1>
    <h1 class="title">修改了样式的标题标签</h1>
</body>
</html>